278 ihering's proposed natural system. 



Order III. : Heteivpoda Lam. 



4th Phylum: PLATYCOCHLIDES Ihering. 



Class I. : IcHNOPODA Ihering. 



Order I. : Protocochlides Ihering. 



Families Ehodopidce Ihering (gen. Rhodope Koll), TetJiydce. 

 (A. & H.) Ihering (gen. TetJiys L.), and Alelibidcz Ihering (gen. 

 Melibe Rang). 



Order II. : Pha?ierobranchia Ihering. 



Families Tritoniadcc A. and H., ScyUceidcz A. and H., Den- 

 dronotidce A. and H., Bornellidce. Bgh., Heroida (Gray) Ad., 

 Dotonidce Ad., ^P.olididx Bgh. (incl. FroctonotidcB), PhyllirroidcE. 

 Ad., DorididcB Bgh., Onchidorididx- Ad., Triopidce Ad., Cora?nbidcB 

 Bgh., Doriopsidoe Bgh., Phyllidiad(E A. and H., PleurophyUidiadce 

 A. and H., and Pleiiroletuidce Bgh. 



Order III. : Sacoglossa Ihering. 

 Families Limapontiadce Bgh., Elysiadcz Bgh., Phyllobranchida 

 Bgh., PlakobranchidcB Bgh., Rennceadce Bgh.. and Lophocercidcz Ad. 



Order IV. : Steganobranchia (Ihering). 

 {=^TectibrancMa Cuv. p.) 

 Families Runcinidce Ad., Siphonariida Ad., Pleu7-obraiichidcB 

 (Fer.) Ad., Aplysiidoe (D'Orb.) Ad., Philinidoe Ad., BuUidce Ad., 

 Cylichnidce Ad., Aphistridce Ad., and Acixonidiz Ad. 



Order V. : Branchiopneusta Ihering. 

 {=Pulmonata basojnmaiophora A. Schmidt.) 

 Families Amphibolidce Ad., Gadiniidce Ad., Liiminidoe Ad.,, 

 and Auriculacea Blv. 



Order VI. : Nephrop7ieusta Ihering. 

 {=Pulmo7iata stylojiwiatophora A. Schmidt., Helicida Gray). 

 Class II.: Pteropoda Cuv. 

 Class III. : Cephalopoda Cuv. 



J.C, ii., Sept., 137!i 



